daimajia/AndroidSwipeLayout · error · IllegalArgumentException

SwipeAdapterInterface can not be null

Error message

SwipeAdapterInterface can not be null

What it means

SwipeItemMangerImpl's constructor requires a non-null SwipeAdapterInterface, which it delegates to for swipe layout resource ids and modes. Passing null leaves the manager unable to operate, so the constructor throws IllegalArgumentException immediately.

Solutions

1. Pass the adapter itself (this) when constructing the manager inside a BaseSwipeAdapter subclass
2. Ensure the adapter field is initialized before the manager is constructed
3. Never pass null; construct the manager lazily after the adapter is available

Example fix

// before
class MyAdapter extends BaseSwipeAdapter {
    SwipeItemMangerImpl mItemManger = new SwipeItemMangerImpl(null);
}
// after
class MyAdapter extends BaseSwipeAdapter {
    SwipeItemMangerImpl mItemManger = new SwipeItemMangerImpl(this);
}

if (adapter == null) {
    throw new IllegalArgumentException("adapter must be initialized before creating SwipeItemMangerImpl");
}
SwipeItemMangerImpl manager = new SwipeItemMangerImpl(adapter);

try {
    this.mItemManger = new SwipeItemMangerImpl(this);
} catch (IllegalArgumentException e) {
    Log.e(TAG, "SwipeItemMangerImpl requires a non-null adapter", e);
}

When it happens

Trigger: Constructing SwipeItemMangerImpl (directly or via a subclass like SwipeItemAdapterMangerImpl / BaseSwipeAdapter) with a null SwipeAdapterInterface argument, e.g. an uninitialized adapter field passed to the manager.

Common situations: Custom adapter sets up the manager in a field initializer before the adapter reference is ready; passing null in tests; subclass forgets to call super(adapter) with a real adapter.

Related errors

• can not find SwipeLayout in target view
• Child does not belong to SwipeListener.

AI-assisted analysis of daimajia/AndroidSwipeLayout@5f8678b047 (2026-09-08). Data as JSON: /api/errors/a55c43a4b944a93c. Report an issue: GitHub.

Appendix: source

Thrown at library/src/main/java/com/daimajia/swipe/implments/SwipeItemMangerImpl.java:34

/**
 * SwipeItemMangerImpl is a helper class to help all the adapters to maintain open status.
 */
public class SwipeItemMangerImpl implements SwipeItemMangerInterface {

    private Attributes.Mode mode = Attributes.Mode.Single;
    public final int INVALID_POSITION = -1;

    protected int mOpenPosition = INVALID_POSITION;

    protected Set<Integer> mOpenPositions = new HashSet<Integer>();
    protected Set<SwipeLayout> mShownLayouts = new HashSet<SwipeLayout>();

    protected SwipeAdapterInterface swipeAdapterInterface;

    public SwipeItemMangerImpl(SwipeAdapterInterface swipeAdapterInterface) {
        if (swipeAdapterInterface == null)
            throw new IllegalArgumentException("SwipeAdapterInterface can not be null");

        this.swipeAdapterInterface = swipeAdapterInterface;
    }

    public Attributes.Mode getMode() {
        return mode;
    }

    public void setMode(Attributes.Mode mode) {
        this.mode = mode;
        mOpenPositions.clear();
        mShownLayouts.clear();
        mOpenPosition = INVALID_POSITION;
    }

    public void bind(View view, int position) {
        int resId = swipeAdapterInterface.getSwipeLayoutResourceId(position);
        SwipeLayout swipeLayout = (SwipeLayout) view.findViewById(resId);

View on GitHub (pinned to 5f8678b047)